Quoted from barakandl:

Following that modification outlined in the FO597 will not let you use 2732 or 2716 at U2 and U6. One of the address lines doesn't have a trace from the cpu for 2732 and I don't think they place all the 'E' pads to pull off a 2716 MOD. This would just be for trying to reuse the original masked ROMs which i wouldn't recommend. The legs on them are usually pretty roached out.
You are better off doing the mod outlined on pinwiki for setting a -17 to use 2732 at u2 and u6. Doing that maximizes the ROM space for max compatibility of -17 and -35 games.
The other good mod for a -17 MPU is the single 2732 at U2. That lets you use any -17 or stern m100 game with only one EPROM. Less sockets to change and not too many jumpers and track cuts.

Quoted from barakandl:Following that modification outlined in the FO597 will not let you use 2732 or 2716 at U2 and U6.

Quoted from Quench:

I've looked at the Pinwiki dual U2/U6 2732 mod and it looks to me like it can be simplified. I will have a deeper look into it tomorrow and report back.

Quoted from Quench:I can confirm that this simpler mod works.
I did the mod on a Stern MPU-100 board which is the same as a Bally-17 board. It's working fine in my -35 Bally game.